用DOM实现文章采集--通过jquery语法式的方法采集指定对象的文本

[csharp]
/// <summary>
/// DOM查询器，用法跟jquery差不多
/// </summary>
public class DomQuery
{
    /// <summary>
    /// 获得节点
    /// </summary>
    /// <param name="_HtmlDocument"></param>
    /// <param name="selector"></param>
    /// <returns></returns>
    /// <remarks>DOM选择器，用法跟jquery差不多</remarks>
    public IList<HtmlNode> Get(HtmlDocument _HtmlDocument, string selector)
    {
        string[] Expressions = selector.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

        List<HtmlNode> hnList = new List<HtmlNode>();

        if (Expressions[0].StartsWith("#"))
        {
            hnList.Add(_HtmlDocument.GetElementbyId(Expressions[0].TrimStart('#')));
            hnList.RemoveAll(x => { return x == null; });

            if (Expressions.Length == 1)
            {
                return hnList;
            }

            for (int i = 1; i < Expressions.Length; i++)
            {
                hnList = Get(hnList, Expressions[i]);
            }
        }
        else
        {
            hnList.AddRange(_HtmlDocument.DocumentNode.ChildNodes.Where(x => { return x.NodeType == HtmlNodeType.Element; }));

            for (int i = 0; i < Expressions.Length; i++)
            {
                hnList = Get(hnList, Expressions[i]);
            }
        }

        return hnList;
    }
    /// <summary>
    /// 查找节点，并直接返回InnerHtml
    /// </summary>
    /// <param name="_HtmlDocument"></param>
    /// <param name="selector"></param>
    /// <returns></returns>
    public string SingleGetInnerHtml(HtmlDocument _HtmlDocument, string selector)
    {
        HtmlNode hn = SingleGet(_HtmlDocument, selector);
        if (hn == null)
            return null;
        else
            return hn.InnerHtml;
    }
    /// <summary>
    /// 查找节点，并直接返回InnerText
    /// </summary>
    /// <param name="_HtmlDocument"></param>
    /// <param name="selector"></param>
    /// <returns></returns>
    public string SingleGetInnerText(HtmlDocument _HtmlDocument, string selector)
    {
        HtmlNode hn = SingleGet(_HtmlDocument, selector);
        if (hn == null)
            return null;
        else
            return hn.InnerText.Trim();
    }
    /// <summary>
    /// 查找节点
    /// </summary>
    /// <param name="_HtmlDocument"></param>
    /// <param name="selector"></param>
    /// <returns></returns>
    public HtmlNode SingleGet(HtmlDocument _HtmlDocument, string selector)
    {
        IList<HtmlNode> hnList = Get(_HtmlDocument, selector);

        if (hnList.Count == 0)
        {
            return null;
        }
        else
        {
            return hnList[0];
        }
    }

    #region 获得属性
    /// <summary>
    /// 获得属性
    /// </summary>
    /// <param name="_HtmlNodes"></param>
    /// <param name="attr"></param>
    /// <returns></returns>
    public string[] Attr(IList<HtmlNode> _HtmlNodes, string attr)
    {
        if (_HtmlNodes == null)
        {
            return new string[0];
        }
        if (_HtmlNodes.Count() == 0)
        {
            return new string[0];
        }
        var v = from x in _HtmlNodes where x.At

补充：Web开发 , ASP.Net ,